Encyclopedia Astronautica
Martlet 4L-2


N2O4/UDMH propellant rocket stage. Loaded/empty mass 243/46 kg. Thrust 20.50 kN. Vacuum specific impulse 300 seconds.

Status: Study.
Gross mass: 243 kg (535 lb).
Unfuelled mass: 46 kg (101 lb).
Height: 1.85 m (6.06 ft).
Diameter: 0.42 m (1.37 ft).
Span: 0.42 m (1.37 ft).
Thrust: 20.50 kN (4,609 lbf).
Specific impulse: 300 s.
Specific impulse sea level: 210 s.
Burn time: 30 s.

More... - Chronology...


Associated Countries
Associated Engines
  • Martlet 4-2 Bull solid rocket engine. 20.6 kN. Development ended 1966. Isp=300s. Used on Martlet 4 launch vehicle. More...

Associated Propellants
  • N2O4/UDMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital manoeuvring engines in the United States, where MMH has been preferred due to a slightly higher density and performance. More...

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